Beat them with a stick until they seperate I have 3 pitbulls takes me a good 2-3 mins of me beating them until they complete stop if any of my dogs bites me on purpose ill slice his fucking throat. That's why I get the broom if not I would of killed all my dogs by now.
Sorry bud but it's your type of dogs that make the news becuase they killed something. You are not training them to do anything. Do a google search there are tons of methods to break some aggression. Plus you have to exercise it out of them.